Chitosan-based films have a great interest in the food packaging field due to their antimicrobial... more Chitosan-based films have a great interest in the food packaging field due to their antimicrobial activity, physicochemical properties, biodegradability, and capacity for food conservation. Some alternatives studied by researchers to the fabrication of these films are the polymer blends and the incorporation of bioactive compounds, chitosan nanoparticles, and metallic nanoparticles. These materials give to packaging excellent mechanical and barrier properties, easy biodegradation, and activity against pathogens. In this review are presented the last advances related to chitosan-based films for food packaging applications of which are highlighted the mechanical properties, barrier properties, and antimicrobial activity.
This study evaluated the sedimentation behavior of the residual sludge produced in the raw water ... more This study evaluated the sedimentation behavior of the residual sludge produced in the raw water treatment using Aluminum Sulfate and saline extract of Moringa Oleifera seed at laboratory scale. The conventional parameter was measured to evaluate the sedimentability of sludge: The Sludge Volume Index (SVI). A completely randomized design with factorial structure was made, taking into account the factor 'Turbidity' of water. The results were analyzed using tables of varianceanalysis. For this study, raw water was collected from the Sinu River in the Mocari neighborhood from Monteria, Colombia, with turbidity levels of 150 NTU, 265 NTU, and 408 NTU. It was evidenced that the sedimentability of the sludge does not differ significantly when the Moringa Oleifera extract or the Aluminum Sulfate areapplied as coagulants. The greater turbidity in the water, the greater the index volume of sludge, regardless of the coagulant used. The coagulants show excellent sedimentation capacity, since the value of the SVI is in the characteristic range.
Coagulation-flocculation is a physical-chemical process responsible for producing the largest amo... more Coagulation-flocculation is a physical-chemical process responsible for producing the largest amount of sludge in the purification of natural raw water. Conventionally, aluminum sulfate or alum has been used as a coagulant. However, disposal of the sludge produced has been problematic for the environment due to excess aluminum. Currently, the convenience of using natural coagulants such as seed extracts from Moringa oleifera (MO) is being studied, although, the properties of sewage sludge produced and its possible reuse are unknown. In this paper the physical-chemical, nutritional and dangerous characteristics from MO sludge were evaluated by using standard methods to verify its potential use in agricultural soils. Results indicated that pH, electrical conductivity, ion exchange capacity, organic matter and micronutrients from sludge were suitable for application to soils with agricultural potential; but deficiency of macronutrients and presence of fecal coliforms limits it to be used as soil improver and not as fertilizer. Sludge stabilization with hydrated lime at doses greater than or equal to 3 % was effective to ensure the elimination of pathogenic microorganisms and to obtain a Class A sludge, unrestricted for agricultural use and suitable for acid soils.
Phelps, fueron realizadas para definir las tasas de desoxigenación (kd) y
aireación (ka) para el ... more Phelps, fueron realizadas para definir las tasas de desoxigenación (kd) y aireación (ka) para el río Sinú. Se tomaron datos históricos de 8 años de seguimiento (2000 a 2007) de Demanda Bioquímica de Oxígeno (DBO), Nitrógeno Total Kjeldhal (NTK), Oxígeno Disuelto (OD), Temperatura y Caudal en 10 estaciones ubicadas a lo largo de la corriente. Una vez calibrado el modelo, se validó con datos tomados desde 2008 a 2014. Se observó que las estaciones cercanas a la presa y al complejo lagunar del Bajo Sinú presentaron valores mayores de kd y menores de ka, no obstante, admisibles para ríos poco contaminados. Los coeficientes variaron dependiendo del tramo, del caudal y de la temperatura a lo largo del año. Sin embargo, estos coeficientes indican que el río Sinú es una corriente con bajos niveles de contaminación y con un alto potencial de autopurificación.
Chitosan-based films have a great interest in the food packaging field due to their antimicrobial... more Chitosan-based films have a great interest in the food packaging field due to their antimicrobial activity, physicochemical properties, biodegradability, and capacity for food conservation. Some alternatives studied by researchers to the fabrication of these films are the polymer blends and the incorporation of bioactive compounds, chitosan nanoparticles, and metallic nanoparticles. These materials give to packaging excellent mechanical and barrier properties, easy biodegradation, and activity against pathogens. In this review are presented the last advances related to chitosan-based films for food packaging applications of which are highlighted the mechanical properties, barrier properties, and antimicrobial activity.
This study evaluated the sedimentation behavior of the residual sludge produced in the raw water ... more This study evaluated the sedimentation behavior of the residual sludge produced in the raw water treatment using Aluminum Sulfate and saline extract of Moringa Oleifera seed at laboratory scale. The conventional parameter was measured to evaluate the sedimentability of sludge: The Sludge Volume Index (SVI). A completely randomized design with factorial structure was made, taking into account the factor 'Turbidity' of water. The results were analyzed using tables of varianceanalysis. For this study, raw water was collected from the Sinu River in the Mocari neighborhood from Monteria, Colombia, with turbidity levels of 150 NTU, 265 NTU, and 408 NTU. It was evidenced that the sedimentability of the sludge does not differ significantly when the Moringa Oleifera extract or the Aluminum Sulfate areapplied as coagulants. The greater turbidity in the water, the greater the index volume of sludge, regardless of the coagulant used. The coagulants show excellent sedimentation capacity, since the value of the SVI is in the characteristic range.
Coagulation-flocculation is a physical-chemical process responsible for producing the largest amo... more Coagulation-flocculation is a physical-chemical process responsible for producing the largest amount of sludge in the purification of natural raw water. Conventionally, aluminum sulfate or alum has been used as a coagulant. However, disposal of the sludge produced has been problematic for the environment due to excess aluminum. Currently, the convenience of using natural coagulants such as seed extracts from Moringa oleifera (MO) is being studied, although, the properties of sewage sludge produced and its possible reuse are unknown. In this paper the physical-chemical, nutritional and dangerous characteristics from MO sludge were evaluated by using standard methods to verify its potential use in agricultural soils. Results indicated that pH, electrical conductivity, ion exchange capacity, organic matter and micronutrients from sludge were suitable for application to soils with agricultural potential; but deficiency of macronutrients and presence of fecal coliforms limits it to be used as soil improver and not as fertilizer. Sludge stabilization with hydrated lime at doses greater than or equal to 3 % was effective to ensure the elimination of pathogenic microorganisms and to obtain a Class A sludge, unrestricted for agricultural use and suitable for acid soils.
Phelps, fueron realizadas para definir las tasas de desoxigenación (kd) y
aireación (ka) para el ... more Phelps, fueron realizadas para definir las tasas de desoxigenación (kd) y aireación (ka) para el río Sinú. Se tomaron datos históricos de 8 años de seguimiento (2000 a 2007) de Demanda Bioquímica de Oxígeno (DBO), Nitrógeno Total Kjeldhal (NTK), Oxígeno Disuelto (OD), Temperatura y Caudal en 10 estaciones ubicadas a lo largo de la corriente. Una vez calibrado el modelo, se validó con datos tomados desde 2008 a 2014. Se observó que las estaciones cercanas a la presa y al complejo lagunar del Bajo Sinú presentaron valores mayores de kd y menores de ka, no obstante, admisibles para ríos poco contaminados. Los coeficientes variaron dependiendo del tramo, del caudal y de la temperatura a lo largo del año. Sin embargo, estos coeficientes indican que el río Sinú es una corriente con bajos niveles de contaminación y con un alto potencial de autopurificación.
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Papers by Jhon Feria
aireación (ka) para el río Sinú. Se tomaron datos históricos de 8 años de
seguimiento (2000 a 2007) de Demanda Bioquímica de Oxígeno (DBO),
Nitrógeno Total Kjeldhal (NTK), Oxígeno Disuelto (OD), Temperatura
y Caudal en 10 estaciones ubicadas a lo largo de la corriente. Una vez
calibrado el modelo, se validó con datos tomados desde 2008 a 2014. Se
observó que las estaciones cercanas a la presa y al complejo lagunar del
Bajo Sinú presentaron valores mayores de kd y menores de ka, no obstante,
admisibles para ríos poco contaminados. Los coeficientes variaron dependiendo
del tramo, del caudal y de la temperatura a lo largo del año. Sin
embargo, estos coeficientes indican que el río Sinú es una corriente con
bajos niveles de contaminación y con un alto potencial de autopurificación.
aireación (ka) para el río Sinú. Se tomaron datos históricos de 8 años de
seguimiento (2000 a 2007) de Demanda Bioquímica de Oxígeno (DBO),
Nitrógeno Total Kjeldhal (NTK), Oxígeno Disuelto (OD), Temperatura
y Caudal en 10 estaciones ubicadas a lo largo de la corriente. Una vez
calibrado el modelo, se validó con datos tomados desde 2008 a 2014. Se
observó que las estaciones cercanas a la presa y al complejo lagunar del
Bajo Sinú presentaron valores mayores de kd y menores de ka, no obstante,
admisibles para ríos poco contaminados. Los coeficientes variaron dependiendo
del tramo, del caudal y de la temperatura a lo largo del año. Sin
embargo, estos coeficientes indican que el río Sinú es una corriente con
bajos niveles de contaminación y con un alto potencial de autopurificación.